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High-temperature kinetics of the reaction between CN and hydrocarbons using a novel high-enthalpy flow tube

Gardez, Aline and Saidani, Ghassen and Biennier, Ludovic and Georges, Robert and Hugo, Edouard and Chandrasekaran, Vijayanand and Roussel, Vivien and Rowe, Bertrand and Reddy, KPJ and Arunan, E (2012) High-temperature kinetics of the reaction between CN and hydrocarbons using a novel high-enthalpy flow tube. In: INTERNATIONAL JOURNAL OF CHEMICAL KINETICS, 44 (11). pp. 753-766.

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Official URL: http://dx.doi.org/10.1002/kin.20730

Abstract

More than 70 molecules of varied nature have been identified in the envelopes of carbon-rich stars through their spectral fingerprints in the microwave or far infrared regions. Many of them are carbon chain molecules and radicals, and a significant number are unique to the circumstellar medium. The determination of relevant laboratory kinetics data is critical to keep up with the development of the high spectral and spatial resolution observations and of the refinement of chemical models. Neutralneutral reactions of the CN radical with unsaturated hydrocarbons could be a dominant route in the formation of cyanopolyynes, even at low temperatures and deserve a detailed laboratory investigation. The approach we have developed aims to bridge the temperature gap between resistively heated flow tubes and shock tubes. The present kinetic measurements are obtained using a new reactor combining a high-enthalpy source with a flow tube and a pulsed laser photolysislaser-induced fluorescence system to probe the undergoing chemical reactions. The high-enthalpy flow tube has been used to measure the rate constant of the reaction of the CN radical with propane (C3H8), propene (C3H6), allene (C3H4), 1,3-butadiene (1,3-C4H6), and 1-butyne (C4H6) over a temperature range extending from 300 to 1200 K. All studied reactions of CN with unsaturated hydrocarbons are rapid, with rate coefficients greater than 10-10 cm3 center dot molecule-1 center dot s-1 and exhibit slight negative temperature dependence above room temperature. (c) 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 753766, 2012

Item Type: Journal Article
Additional Information: Copyright for this article belongs to WILEY-BLACKWELL,USA
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 06 Dec 2012 10:20
Last Modified: 06 Dec 2012 10:20
URI: http://eprints.iisc.ernet.in/id/eprint/45421

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